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Finding the Fourth Proportional to 18,640.72, 27,961.95 and 5,493.20

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Solution

The fourth proportional to 18,640.72, 27,961.95 and 5,493.20 is: 8,240.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,640.72 : 27,961.95 = 5,493.20 : x
  2. Step 2: Convert to fraction form
    18,640.72/27,961.95 = 5,493.20/x
  3. Step 3: Cross multiply
    18,640.72x = 27,961.95 × 5,493.20
  4. Step 4: Simplify right side
    18,640.72x = 153,600,583.74
  5. Step 5: Solve for x
    x = 153,600,583.74/18,640.72
  6. Step 6: Final answer
    x = 8,240.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.